When you guys say clubs, you mean private tennis club$$$$$?
When I was 10, I was recruited during an open session at the San Dieguito Tennis Club in Encinitas, CA and got a scholarship for coaching. From there it was a private coach, ex-WTA player from the 80s who had a stable of young guys she worked with 1-1. She would arrange round-robin tournaments to be played throughout the week at private courts she had access to in Rancho Santa Fe and Del Mar. On weekends, she would pack us into her van and drive us to USTA tournaments all over SoCal. I won some rounds but never a tournament. I think my best result was 2nd place at the La Costa Resort and Spa, where they used to have a pretty big WTA tournament. Got to play on center court in the final. Eventually, I got tired of losing, so I quit in middle school. I was just a prepubescent kid swinging a Prince Graphite Classic.
Where all the 4.5 playground grinders at?
Okay, I watched a bunch 3.5-4.5 NTRP match play videos. People would be pissed if I showed up calling myself a 3.5.
Dude I played with the other day has won 4.0 tournaments and plays 4.5s as well, said he was trying to keep up with me. He plays at the Balboa Challenge Courts 4.5+ on weekends and that it would be a competitive level for me. I'll start there and look into spring flex leagues when registration opens for those.
I moved to Carlsbad after 20 years in SF, and I'm shocked by how privatized and scarce tennis is here compared to SF. Private clubs, empty HOA courts. You would think there would be league play somewhere in North County SD, but the closest location is La Jolla

. I used to just cruise to the Golden Gate Tennis Center, hit against the wall and meet all kinds of solid players. Started getting into wicked old man doubles matches, and playing sets with ex-college players and good players from all over the world -- France, Morocco, Russia. Miss that grassroots scene.